1) Yes, I agree because musicians are usually playing on stage and there is action in the photo where as an actor the person is just standing there doing nothing.
2) I liked both of the photographers work but I think I liked Bob Gruens work more because I thought they looked more professional.
3) The photo of the female singer with the strobe light behind and the photo captured like 5 different images in one.
4) I think he did that to show the difference in the times that he took the photos. When he took the Clash photo it was in black and white but when he took Green Days photo it was in color, so mayeb just to show the different color of the same but at the same time different picture.
5) Yes, I enjoyed the episode and I think we should watch another one.